Best Tools to Track Promises You Made Over Email (2026)

The problem is small, specific, and expensive. You wrote a message that included the words "I'll get that over to you by Thursday." Thursday came. You did not get it over. The client had to ask, and now the client is deciding whether that pattern is a one-off or a fact about you.

Every roundup in this space quietly assumes the promise-tracking question is the same as the follow-up question. It is not. Follow-ups are about what other people owe you. This is about what you owe them, and the signal lives in your sent folder — a sentence you wrote days ago, a soft deadline you already forgot, a small commitment made inside a longer reply. The tool that solves it has to read outbound mail, not inbound, and the honest thing to say is that very few tools were built for that job.

This post ranks eight of them on the one axis that decides fit: does the tool actually scan your sent mail for commitment language and surface it before the deadline you promised, or does it wait for you to flag every message by hand? We build AI Emaily and it is our top pick for the reading-your-sent-mail version of the job. If you already live entirely inside a project tool like Asana or Linear and your commitments belong in a task list your team can see, this is the wrong category — extract the task at send time into that tool and stop reading. For everyone else, here is the shortlist.

The short answer#

For a mixed inbox with Gmail, Outlook, or IMAP where the commitments hide inside long two-party threads, AI Emaily is our pick. It reads your sent mail on sync, flags deadline language you wrote, and drafts the follow-through — or a courteous heads-up if the deadline is going to slip — in your voice from a user-set Personal Context brain and per-client profiles. Copilot holds the draft for a one-tap approval; Autopilot can act inside guardrails you configure.

For a Gmail-only user who prefers pull over push, Shortwave is the honest concession here — its AI Assistant lets you ask the archive "what did I promise Sam this week?" and get a real answer. Shortwave has built harder on semantic search across the Gmail archive than we have. If your problem is best solved by a search bar you type into, that is the tool.

For a light user with occasional commitments, Gmail Tasks or an Outlook Follow-Up flag is free, already installed, and enough. We build AI Emaily. That is why it is entry number one and the longest section below. Read the limits before you buy.

How we compared#

The comparison is built from vendor documentation and public product pages, checked in August 2026. We did not run eight tools in parallel for a month against the same mailbox. What we can compare honestly is documented capability — what each vendor says the product does with sent-mail content, and where the architecture places a hard ceiling on that answer.

There are no competitor prices in this post. The category has repriced repeatedly through 2025 and 2026, and any number printed today will be stale before you finish reading. Check the vendor's own pricing page on the day you decide to buy.

• Commitment detection — does the tool scan sent mail for phrases like "I will send by Friday" and surface them, or does it require you to flag every message at send time?
• Where the signal lives — inbound (what you owe from others), outbound (what you owe them), or both
• Trigger model — scheduled reminder, semantic query on demand, or an agent that acts on a detected obligation
• Provider coverage — Gmail only, Gmail plus Outlook, or standard IMAP accounts too
• Packaging shape — free tier, trial, per-seat, or usage-metered — described qualitatively, not priced

Eight promise-tracking tools compared at a glance#

The table below narrows the shortlist on the axis that decides fit. The entries after it have the detail on where each ceiling sits, and where the tool is a wrong shape for the job.

1. AI Emaily — best overall for detecting commitments in your sent mail#

We build AI Emaily, which is why it is first here and why this entry is the longest in the roundup. Discount the ranking and read the limits at the end. It is an AI-native email client that connects Gmail, Microsoft 365 and Outlook, and standard IMAP accounts into one inbox, and runs a chief-of-staff agent across all of them.

For promise tracking the mechanism is what matters. On every sync the agent reads both sides of a thread, including the messages you sent. When you write a sentence that carries a commitment — "I'll get that over to you by Thursday," "I owe you the revised deck next week," "I'll circle back after the board call" — the agent extracts the obligation, attaches a deadline, and tracks it against the thread. When the deadline is approaching and the thing has not gone out, the obligation surfaces on the dashboard alongside a draft you can approve — either the deliverable if the context is there, or a short heads-up that it will land a day later.

The control model is the same three modes that run through the product. Manual keeps the agent on-demand. Copilot is the default — every draft waits in the Agent drafts queue for a one-tap approval. Autopilot can send inside guardrails that all apply at once: a sender allow-list, a confidence floor that holds low-scoring drafts for review, an undo window after send is queued, escalate-if keywords that force human review, and a global pause. Every action is written to an append-only audit log with the reasoning, matched rule, and confidence score. Voice comes from a user-set Personal Context brain and per-client profiles you write yourself; it is not inferred from your past mail.

Limits stated plainly. The macOS app is downloadable — real Dock presence, system notifications — built as an Electron shell around the web interface, Apple Silicon only, not in the Mac App Store. Windows ships a native installer. iOS is on the App Store. Android is a PWA today, with a native app on the roadmap. There is no Linux build. Commitment detection is only as good as sync — a mailbox we cannot connect to is a mailbox we cannot read. Very short one-word promises embedded in a hundred-recipient thread are noisier than the same promise on a two-party conversation. Packaging is a 7-day free trial on Pro/Autopilot; card required, cancel before day 7 and you are not charged. We build AI Emaily.

2. Shortwave — the honest concession for a Gmail-only semantic-search workflow#

Shortwave is an AI-native Gmail and Google Workspace client built by ex-Google engineers. It reaches the promise-tracking job from a different angle to the rest of this roundup: instead of a background agent that flags commitments as they are written, its AI Assistant runs semantic queries across your Gmail archive on demand. Typing "what did I promise Sam this week that I haven't delivered?" into the assistant and getting a real answer back is exactly the workflow it was built for.

The formal concession, said plainly: Shortwave has built harder on semantic search across the Gmail archive than we have. If your problem is best solved by a search bar you type into, and your mail lives entirely in Gmail, Shortwave is the better fit. That is not a hedge — it is a real difference in product focus, and a reader who wants pull-from-search rather than push-from-agent should buy Shortwave.

Where Shortwave stops on this particular job: it will not proactively flag a commitment you wrote three days ago and forgot about — you have to remember to ask. It is Gmail and Google Workspace only, so an Outlook or IMAP account is out of scope. As of mid-2026 the founding team's public focus has shifted toward a separate agent product called Tasklet and the free plan has narrowed; the client is actively supported. Verify current plan details on the vendor page.

3. Superhuman Mail — best for keyboard-first, remember-at-send-time workflows#

Start with the name, because most search results have not caught up. Grammarly acquired Superhuman, the email client, in July 2025, then renamed the parent company to Superhuman in October 2025. Today Superhuman Mail is the email client; the Superhuman Suite is the broader bundle. Reviews describing Superhuman as an independent startup were written before the acquisition.

For promise tracking, the primary mechanism is Reminders — you set one on the message you just sent, and the thread returns to your inbox on your chosen date. Auto Labels can flag categories of thread that might need attention. Instant Reply drafts a response for you to review; the send step is always yours. The keyboard-first design means setting a reminder is a single keystroke, and for someone processing high volume by hand that throughput difference is real.

The limit is what defines the product: it is a remember-at-send-time model. If you meant to set the reminder and forgot, or you did not realise until later that the sentence you wrote was a commitment, Superhuman will not surface it for you. After the Grammarly acquisition, AI features moved into a higher business tier and packaging shifted; verify which tier includes what you actually need on the Superhuman page before committing.

4. Fyxer — a note on why an overlay is a mismatched shape for this job#

Fyxer is an overlay on Gmail and Outlook — not an email client — that adds triage, drafting, and meeting notes to whatever provider you already use. It is a genuinely useful tool for the inbound half of the day, and if that is your bottleneck it belongs on your shortlist.

For the specific job of scanning sent mail for commitments, though, the product is a mismatched shape. Fyxer does not publish a sent-mail commitment-extraction capability; its published surface area is inbound triage and reply drafting. That is not a gap the tool is hiding — it is a different product. Including it in this table is honest because a reader searching for a promise tracker will land on Fyxer's page and need to know whether the fit is real.

Where Fyxer wins is the inbound side of the job it was built for. If your promises-to-track problem is really a can't-keep-up-with-inbound problem, and the sent-side commitments are downstream of that, Fyxer belongs on the other shortlist and this one is not it. Packaging is a trial plus per-seat paid plans; check the current vendor page.

5. Boomerang for Gmail — the archetype, still Gmail-only, still manual at send#

Boomerang is the tool the entire nudge category was named after. It attaches to Gmail as an extension. At send time you can tell it to return the thread to your inbox after a window you set — a day, three days, next Monday — and when the window ends the thread comes back to the top. You then write the deliverable or the heads-up. Its Inbox Pause and Send Later features are peripheral; the boomerang-on-send is the reason it exists.

For promises made over email, the model is straightforward: you know at send time you have committed to something, and you Boomerang the message to yourself on the deadline. It works, it is polished, and for a Gmail-only user who is disciplined at send time it needs nothing else.

Where Boomerang stops: it is Gmail-only, there is no drafting — every follow-through is on you — and there is no reading of the sent mail. If you forgot to Boomerang the message when you sent it, the promise is not tracked. Packaging is free-tier plus per-seat paid plans; check current tiers on the vendor page.

6. Sanebox — best for a server-side reminder on sent mail without switching clients#

Sanebox is a server-side triage service. You keep the client you already use — Gmail, Outlook, Apple Mail, anything IMAP — and Sanebox filters and reminds from the mail server. For promise tracking, its Reminders feature is the relevant piece: when you send a message that expects a response by a certain window, Sanebox can return the thread to your inbox if no reply arrives.

That is more about tracking what other people owe you than what you owe them, but there is a practical overlap: many of your commitments are made in reply to a request, and getting the thread back on your radar is often enough to remind you. Because Sanebox runs on the server it works across every mail account you connect, without an extension, which is why it survives when browser extensions age poorly.

The limit is that it does not scan sent-mail text for commitment language. It is a scheduled reminder engine you have to set intentionally, not an agent that reads what you wrote. And it does no drafting — the follow-through is entirely on you. Packaging is a free trial then paid tiers by feature set; check the current vendor page.

7. Todoist for Gmail — best when your promises belong in a real task list#

Todoist is a task manager with a Gmail add-on and an Outlook add-in. From an email you just sent — or one you received — you can create a Todoist task, attach a due date, and link back to the message. The task lives in your Todoist project alongside everything else; the email is a reference, not the source of truth.

For a certain kind of reader this is the honest right answer. If your commitments belong in a task list you review daily, and you already run Todoist for the rest of your work, capturing an email promise as a task at send time keeps the commitment somewhere you will actually see it. Any Kanban tool works this way — Asana, Linear, ClickUp — and the correct question is whether the promise fits your existing weekly review rather than whether the email tool is smart.

The limit is that it is manual and captured at send time. Todoist does not read your sent folder and surface commitments you forgot to capture — that is not what it is for. And you now have two systems: the email and the task. For some readers that is the point; for others it is friction.

8. Gmail Tasks + Outlook Follow-Up flags — best free option, and the honest baseline#

Before installing anything, both major providers ship native features that cover the light version of this job. In Gmail, you can add an email to Google Tasks with one click — the message links to the task, you add a due date, and the reminder fires on your calendar. Outlook's Follow-Up flag is the counterpart: right-click a message you sent, add a reminder date, and Outlook surfaces it either as a Tasks entry or a notification when the date arrives.

Neither reads your sent mail. Neither drafts anything. Neither is going to catch the commitment you did not notice you had made. But both are free, already installed, and answer the question for a meaningful slice of users. For someone with three or four commitments a week, the native option is the right starting point.

Turn one of them on today. Live with it for two weeks. If you find yourself missing promises because you did not remember to flag them at send time, then you know exactly what shape of tool you need to add — and you have a real baseline to compare it against.

The tools above cluster into three real shapes: reading agents that scan sent mail for commitments, on-demand semantic search over the archive, and manual reminders set at send time. Which shape fits depends on whether you know at send time what you just promised — or whether the sentence slid past you and it is your future self who needs to be told.

How to choose for your situation#

Match the primary problem first, then the provider constraint. Trying to evaluate eight tools in parallel is how people end up with nothing chosen and their commitment backlog untouched.

Can AI actually detect a commitment in an email?#

This is the question the category quietly hopes you will not ask. The honest answer is: sometimes, and it depends on what the tool is doing.

A sentence like "I'll send the revised deck by Friday" is a strong signal. It has a first-person subject, a verb of commitment, an object, and a deadline. A well-tuned agent will catch that reliably. "Let me look into that" is weak — it is a promise to consider, not a promise to deliver, and the honest tool will not flag it. In between sits the class most people care about: "I'll get back to you shortly on the pricing" has an implicit deadline that a human interlocutor will treat as "within a day or two," and whether the tool matches that expectation depends on how it handles vague temporal language.

An inbox agent that reads sent mail — AI Emaily is the primary example in this roundup — can catch the strong and medium cases and correctly ignore the weak ones. It also depends on the agent reading the thread in context, which is not guaranteed on complex conversations. Ask this question of any tool you evaluate; a vendor that cannot explain their extraction mechanism in one paragraph does not have one worth trusting.