| App | One-time price | Platforms | License | Free tier | Same platform |
|---|---|---|---|---|---|
| Mental Math Pro(this app) | Free tier, $14.99 one-time | Web | License not confirmed | Yes | – |
| ePaperCraft SHIRYU | $5 one-time | Windows | License not confirmed | No | No |
| SendMyVoice | Free | Web | License not confirmed | Yes | Yes |
| AudioNotes | $199 one-time | Web | License not confirmed | No | Yes |
| Chatkit | $29 one-time | Web | License not confirmed | No | Yes |
| PulsarChat | $39 one-time | Web | License not confirmed | No | Yes |
| AI Fruit | Free tier, $25 one-time | Web | License not confirmed | Yes | Yes |
| AI music studio for podcasters and game devs | Free tier, $4.99 one-time | Web | License not confirmed | Yes | Yes |
| AIGenTools | Free tier, $11 one-time | Web | License not confirmed | Yes | Yes |
| Audiotext | Free tier, $69 one-time | Web | License not confirmed | Yes | Yes |
| BrainDip | See website | Web | License not confirmed | No | Yes |
| GenExpert | Free tier, $35 one-time | Web | License not confirmed | Yes | Yes |
| ResumeHQ | Free tier, $19 one-time | Web | 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 Mental Math Pro: shared category, tags, platforms and community likes.












ePaperCraft SHIRYU is the closest pay-once alternative to Mental Math Pro. ePaperCraft SHIRYU lets you design, unfold, and print paper models. With 70+ ready-to-build templates, it's perfect for hobbyists and educators. Enjoy a one-time purchase with free updates and commercial use rights for your creations. It costs $5 one-time and runs on Windows.
Yes. SendMyVoice, AI Fruit, AI music studio for podcasters and game devs, AIGenTools and Audiotext offer a free tier, and each also sells a one-time license if you outgrow it.
AI music studio for podcasters and game devs is the lowest-priced option at Free tier, $4.99 one-time, compared with Free tier, $14.99 one-time for Mental Math Pro. All prices are one-time license fees, not subscriptions.
Yes. ePaperCraft SHIRYU is available on Windows, which Mental Math Pro 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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