| App | One-time price | Platforms | License | Free tier | Same platform |
|---|---|---|---|---|---|
| Koi(this app) | Free tier, $99 one-time | Mac | Perpetual, lifetime updates | Yes | – |
| Kanmail | Free tier, $49 one-time | Linux, Mac, Windows | License not confirmed | Yes | Yes |
| OpenStickies | Free tier, $7.49 one-time | Linux, Mac, Windows | License not confirmed | Yes | Yes |
| Plume | Free tier, $59.99 one-time | Mac | Perpetual, lifetime updates | Yes | Yes |
| Folge | Free tier, €75 one-time | Mac, Windows | License not confirmed | Yes | Yes |
| Ommiq | Free tier, $1.99 one-time | Browser Extension, Web | Perpetual, lifetime updates | Yes | No |
| Fluent | Free tier, $49 one-time | Mac | License not confirmed | Yes | Yes |
| SendMyVoice | Free | Web | License not confirmed | Yes | No |
| aText | Free tier, $29.99 one-time | Mac, Windows | License not confirmed | Yes | Yes |
| Notchie | Free tier, $29.99 one-time | Mac | License not confirmed | Yes | Yes |
| Sharespeak | $13 one-time | Mac, Windows | License not confirmed | No | Yes |
| TextSniper | $7.99 one-time | Mac | License not confirmed | No | Yes |
| Unfold | Free tier, $7 one-time | Mac | License not confirmed | Yes | Yes |
Prices are one-time license fees as listed on each developer's site and may change. Ranked by similarity to Koi: shared category, tags, platforms and community likes.
Kanmail is the closest pay-once alternative to Koi. Turn your inbox into a kanban board for organized email management. Integrate Gmail, Outlook, and more into one view. Enjoy color-coded senders and lightning-fast shortcuts for seamless workflow transitions. Pay once, own forever for $49 USD! Secure and private. It costs Free tier, $49 one-time and runs on Linux, Mac and Windows.
Yes. Kanmail, OpenStickies, Plume, Folge and Ommiq offer a free tier, and each also sells a one-time license if you outgrow it.
Ommiq is the lowest-priced option at Free tier, $1.99 one-time, compared with Free tier, $99 one-time for Koi. All prices are one-time license fees, not subscriptions.
Yes. Kanmail, OpenStickies, Folge, Ommiq and SendMyVoice are available on Linux, Windows, Browser Extension and Web, which Koi does not support.
No. Every app on PayOnceApps is listed because it sells a one-time (perpetual) license. Some also offer a free tier or trial. Prices are checked against the developer's site but can change, so confirm on the app's website before buying.
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