SimplyFile vs Folder Suggest: Which Outlook Filing Add-in Is Right for You?
Both SimplyFile and Folder Suggest use AI to suggest where emails belong in Outlook. But they're built on different ideas about how AI should work — and those differences affect who each tool is right for. Here's an honest comparison.
Filing emails into Outlook folders by hand is one of those tasks that seems minor until you actually add up the time. Drag-and-drop across dozens of folders, dozens of times a day, adds up fast. Both SimplyFile (by TechHit) and Folder Suggest try to solve this by predicting where each email belongs so you can confirm it with a single click.
But beyond that shared goal, the two tools are quite different: in how their AI works, which versions of Outlook they support, what they cost, and what extra features they include. This comparison covers what matters most.
What Is SimplyFile?
SimplyFile is an Outlook add-in for Windows, developed by TechHit, that has been around since the mid-2000s. It uses behavioral AI — meaning it learns from your filing history. Every time you move an email to a folder, SimplyFile records that action. Over time, it builds a model of your habits and uses it to predict where new emails should go.
The workflow is keyboard-first. You select one or more emails, press a keyboard shortcut (or click the SimplyFile button in the ribbon), and a small window appears with a folder prediction. Press Enter and the email moves. No mouse required. For users who prefer staying on the keyboard, this is a genuinely fast way to work.
SimplyFile also includes several features beyond basic filing:
- Send & File. When you reply to an email, SimplyFile files the conversation automatically in one action.
- Thread and sender filing. File all emails in a thread, or all emails from a sender, at once.
- Message snooze and task conversion. Available on Pro and Ultimate tiers.
- Filing history. A searchable archive of where emails were filed (Ultimate tier, 1-year retention).
SimplyFile runs entirely on your machine. According to TechHit's own documentation, email content is not sent to TechHit servers or any external service.
Pricing is subscription-based, billed annually: Standard at $59.88/year, Pro at $95.88/year, and Ultimate at $149.88/year. A free trial is available.
What Is Folder Suggest?
Folder Suggest is a free Outlook add-in that takes a semantic approach. Instead of learning from your past filing decisions, it reads the content of the email you're viewing — sender, subject, and body — and compares it against the emails already stored in each of your folders using an on-device language model.
The result is a ranked list of folders, ordered by how closely their existing content matches the current email. There's no training period. No filing history needed. The add-in works immediately after installation, even on a brand new Outlook profile.
Key features:
- Semantic AI. Understands what an email is about, not just who sent it or where similar emails went before.
- On-device processing. The language model runs entirely on your machine. Nothing is sent externally.
- No setup required. No configuration, no rules, no training period. Works immediately on install.
- Works in New Outlook. Supports Outlook on the web, New Outlook for Windows, and Classic Outlook for Windows.
- Free. No subscription, no tiers, no cost.
The one thing Folder Suggest doesn't do: automatically file emails without your involvement. It makes a suggestion; you confirm it. There's no equivalent of SimplyFile's Send & File, and it doesn't touch sent items.
SimplyFile vs Folder Suggest: Head-to-Head Comparison
| Feature | SimplyFile | Folder Suggest |
|---|---|---|
| AI approach | Behavioral — learns from your filing history | Semantic — reads and understands email content |
| Privacy / data handling | Local — not sent to TechHit servers | On-device — nothing leaves your machine |
| Pricing | $59.88–$149.88/year | Free |
| Setup complexity | Medium — Windows installer + .NET Framework | Low — standard Outlook add-in install |
| Works offline | ✓ Yes — fully local | ✓ Yes, once model is downloaded |
| Outlook versions supported | Classic Outlook for Windows only (2013–2021, M365) | Outlook on the web, New Outlook, Classic Outlook |
| Mac support | ✗ Not supported | ✓ Yes (via Outlook on the web) |
| Training / warm-up needed | Yes — needs filing history to learn from | No — works immediately from install |
| Send & File | ✓ Yes (all tiers) | ✗ Not available |
| Thread & sender filing | ✓ Yes (Pro and above) | ✗ Not available |
| Message snooze / task conversion | ✓ Yes (Pro and above) | ✗ Not available |
| Learning curve | Low — just file emails and it improves | None — works immediately |
Key Differences Explained
Behavioral AI vs. semantic AI
SimplyFile's predictions are based on what you've done before. If you've consistently moved emails from a particular sender or with a particular subject pattern into a specific folder, SimplyFile will predict that folder again. This works very well once it has enough history to learn from — typically a few weeks of regular use.
The limitation is the cold start problem: SimplyFile needs filing history before it can make useful predictions. On a fresh Outlook profile, a new folder structure, or for email types you haven't encountered before, it won't have much to go on.
Folder Suggest's predictions are based on content similarity. It compares what an email is about against the emails already stored in each folder. An email about a project kickoff will match a "Project Name" folder even if you've never received a similar email before — as long as your folder contains related emails to match against. No prior filing decisions required.
Platform support
This is one of the most consequential practical differences. SimplyFile is a Windows application that hooks into classic Outlook for Windows. It does not work with New Outlook for Windows, Outlook on the web, or Outlook for Mac. If your organisation is migrating to New Outlook — which Microsoft has been pushing as the default on Windows 11 — SimplyFile will stop working.
Folder Suggest is built as a standard Outlook add-in and runs in all three major contexts: Outlook on the web, New Outlook for Windows, and Classic Outlook for Windows. It also works on Mac via Outlook on the web.
Cost
SimplyFile's Standard tier starts at $59.88/year per user. For a team of ten, that's roughly $600 per year just for email filing. The full-featured Ultimate tier is $149.88/year per user.
Folder Suggest is free. There are no tiers, no trial periods, and no per-user costs for organisations.
Extra features
SimplyFile does more things. Send & File is the most distinctive: when you reply to an email, you can file the entire conversation in the same action. For lawyers, accountants, or anyone who bills time against client matters and needs every email in the right folder, this is a meaningful efficiency gain.
SimplyFile also lets you file an entire thread at once, snooze messages for later, and convert emails into tasks or calendar events. These features have nothing to do with folder prediction but make it a broader email-management tool.
Folder Suggest is focused exclusively on suggesting where to file the email you're currently reading. It doesn't touch sent items, doesn't batch-file threads, and doesn't add snooze or task features. If you need those capabilities, SimplyFile has a clear advantage.
Who Should Choose SimplyFile?
SimplyFile is the better fit if:
- You use classic Outlook for Windows and have no plans to move to New Outlook
- Send & File matters to you — filing sent items alongside replies in one action
- You have an established filing history for SimplyFile to learn from
- Keyboard-driven workflows are important to your speed
- You want a more complete email-management tool, not just folder suggestions
- You process high email volume and the productivity gain justifies a subscription
Who Should Choose Folder Suggest?
Folder Suggest is the better fit if:
- You use Outlook on the web, New Outlook for Windows, or Outlook for Mac
- You want a free tool with no subscription or per-user cost
- You're setting up a new profile, or have recently reorganised your folder structure
- Suggestions based on what an email is about matter more than past filing patterns
- You want a simple install with no additional Windows software or framework required
- You receive a lot of email about new topics or from new senders that behavioral AI wouldn't yet know how to handle
Verdict
SimplyFile is a mature, well-regarded tool with a loyal following among power users on classic Outlook for Windows. The keyboard-first workflow, Send & File, and thread-filing features are genuinely useful — particularly for professionals who need every email in the right place, including sent items. The subscription cost is the main barrier for many users.
Folder Suggest is the more accessible choice: free, compatible with the future direction of Outlook (New Outlook and web), and useful immediately without needing to build up filing history first. It focuses on one thing and does it without asking you to pay for it.
If you're on classic Outlook for Windows and need Send & File, SimplyFile is worth considering. For everyone else — especially anyone using New Outlook or looking for a SimplyFile alternative that's free — Folder Suggest is a strong option.
Looking for a free alternative to SimplyFile? Folder Suggest works in New Outlook, Outlook on the web, and Classic Outlook — with no subscription required.
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