The Open-Source Autocompletes Are Good. Here Is What a Paid App Adds.
Here is something I do not say enough, because it does not fit the marketing story: the free, open-source autocomplete apps for the Mac are good, and my app literally would not exist without one of them.
WriteAmp's core comes from KeyType, an open-source project, and I have always kept that attribution public. The idea of local, Tab-to-accept autocomplete did not start with me. It started with people who published their code so anyone could build on it, and I built on it. If you are considering WriteAmp and wondering why you would pay $29 when Cotabby, TabType, and KeyType are sitting right there for free, that is a fair question, and it deserves an honest answer.
The free options are genuinely good
Let me start by being clear. If you are handy, if you like tinkering, if you do not mind filing an issue when something breaks, the open-source options are a legitimate choice, and for some people they are the right one. They run locally, they respect your privacy, they do the Tab-to-accept thing, and they cost nothing. I am not going to trash them to sell you mine. I have recommended them before in the category map, and I meant it.
They are also, honestly, where the energy of the category lives. A rising tide of open autocomplete is good for everyone who types, including me, because it normalizes the whole idea of a local Tab key.
What the open-source trade actually is
The trade is not quality, because the models can be similar. The trade is the boring stuff around the edges. Let me be specific about what you are getting for $29, because "you are paying for polish" is a slogan, and I would rather give you the list.
- No cost, readable code, full control
- Active projects with real momentum
- Beta and alpha labels, rough edges, app coverage varies
- When it breaks, it is on you to report or fix it
- Notarized by Apple, so install does not fight the OS
- Hardened per-app behavior across the apps people actually type in
- Published benchmarks, update channel, support
- Maintenance, so it keeps working as the Mac changes
The $29 is buying the part of software that is invisible until it is missing. The notarization that means you are not fighting Gatekeeper. The per-app compatibility work, because autocomplete breaks in weird ways in specific apps, and fixing that is a thousand small battles, not one big one. The benchmark that tells you honestly how it performs. The person who answers when something goes wrong. And the maintenance, the unglamorous work of keeping a local app alive as macOS updates and browsers change.
I wrote about the benchmark numbers and what the one-time price covers, and the short version is that you are paying for the difference between software that is built for you and software that is built for its contributors.
The honest caveats
There are two things I will not dress up. First, open source can disappear or stall, but so can a paid app from a solo developer. I have been honest about what happens when I am the only employee, and the answer is the same either way: local software keeps working because it is local. Second, if you are the kind of person who genuinely enjoys maintaining your own tools, the open-source route is not a compromise, it is the hobby. You are not the customer for this post, and that is fine.
There is also a deeper honesty about my own situation. KeyType is MIT licensed, which is what made WriteAmp possible, and I owe that project a real debt. The reason WriteAmp exists as a paid app rather than another free fork is not greed. It is that a solo developer cannot spend a thousand hours on compatibility work and support without some way to pay for groceries. The open-source projects can afford to be free because they are labors of love or stepping stones. WriteAmp is a job, and I would rather be honest that a job needs revenue than pretend otherwise.
If cost is the constraint, genuinely, start with the open-source options and run the 30-day WriteAmp trial next to them. Pick with your own hands. If the free one does everything you need, use it, and I mean that. If the trial shows you what the boring parts are worth, you know where the $29 goes.
The test
Do not take my word for any of this. Run Cotabby or TabType for a week. Then run WriteAmp's 30-day trial for a week. Type in the same apps, notice where each one stumbles, notice which one you stop thinking about. The right answer is whichever one you forget you are using, and if that answer is the free one, you have lost nothing but a week.
The compare page has the fuller breakdown, and the benchmarks are there if you want numbers instead of opinions. Whatever you pick, I am glad the category exists, because a Mac where autocomplete is normal is a Mac where I do not have to retype the same sentence, and that was the whole point of building on open source in the first place.
Sources
- KeyType on GitHub: the MIT-licensed open-source project WriteAmp's core derives from, with attribution
- Cotabby: a local open-source autocomplete for macOS
On macOS 26+ Macs, Apple Intelligence mode stays free even after the trial ends — you always keep a working path to suggestions.
Written by Amit Ashwini, who builds WriteAmp and runs its marketing. More: why the Tab key beats the chat box · mini, midi, and max compared · benchmark methodology.