LeanFPS13 questions · checked 2026-10-10 · sources below
LeanFPS vs Radiant Optimizer
LeanFPS vs Radiant Optimizer, side by side: both are Windows 10 and 11 game optimizers with a free version and a one-time price. They differ on price, refunds, licence rules and whether the app measures your FPS. Every cell below is something the maker states, with the source.
LeanFPS vs Radiant Optimizer comparison table
| Question | LeanFPS | Radiant Optimizer |
|---|---|---|
| Price of the full version | Pro: $19 early-bird, paid once$29 after the public release; 14-day refund. | Premium: $57.77, paid oncePlans page: “USD · paid once”. |
| One-time or subscription | One-time, no subscriptionUpdates included, no renewal. | One-time, no subscriptionTerms: updates for the product’s “commercial lifespan”; a major successor may need a separate purchase. |
| What Free includes | Game detection, FPS measurement and 5 core tweaksHigh performance plan, CPU cores awake, Game Mode, background recording off, PC awake. Your first 3 games run with every Pro tweak. | PC scan, 8 starter Windows tweaks, network and input tests, System Restore toolsGame profiles are Premium; Free shows a preview. |
| Time limit on Free | None | None statedPlans page: “$0 · No card”. |
| Account to start | No account | No account for FreePremium needs an account. |
| PCs per licence | Up to 3 PCs | One PCRefund policy: the licence is tied to your motherboard. |
| Refunds | 14 days, no questions asked | “All sales are final”Terms. The refund policy lists exceptions such as double charges and problems they cannot fix. |
| Windows versions | Windows 10 and 11 | Windows 10 & 11 |
| Available today | Pro on sale now; download is reservedPublic download opens with the first code-signed release; reserve it on the download page. | Free download and Premium checkout are live |
| Does it promise more FPS? | NoResults depend on your PC. LeanFPS shows your own before and after. | NoFAQ: it “can’t control game servers or guarantee FPS, ping or hit registration”. |
| FPS figures on the home page | Simulated demos, labelled “Simulated”No FPS gain is quoted. | 120 → 157 FPS demo, labelled simulated“Illustrative demo. FPS values and stutters are simulated, not measured Radiant results.” |
| Measures FPS on your PC | Every session: average, 1% and 0.1% lowsFrom Windows event tracing, compared with your usual. No overlay. | Premium performance overlayHow it measures and whether it keeps 1% lows is not stated. |
| Download size | About 6.5 MB, one exe | 194 MB installer (v7.0.4) |
Radiant Optimizer is a product of its owner; LeanFPS is not affiliated with it. If anything here is out of date, email contact@leanfps.com.
Where LeanFPS vs Radiant Optimizer really differ
Price and licence
Both are one payment with no subscription. Radiant Optimizer Premium is $57.77 for one PC, with the licence tied to your motherboard, and its terms say all sales are final. LeanFPS Pro is $19 for up to three PCs with a 14-day refund. The catch is the download: both can be bought today, but LeanFPS is still early access by email until the first signed public release. See LeanFPS pricing.
What you get for free
Radiant Optimizer Free is the wider toolbox: a PC scan, eight starter tweaks, network and input tests and restore tools. LeanFPS Free is narrower and focused on games: it detects the game you start, applies five core tweaks and measures FPS in every session, and the first three games you play get every Pro tweak so you can compare. Neither free version has a time limit.
Proof
Neither maker promises a number of frames, and both label their home page demos as simulated. The difference is what happens on your PC. LeanFPS records average FPS, 1% and 0.1% lows per session and compares them with your usual, so a tweak that does nothing shows up as nothing. Radiant Optimizer Premium has a performance overlay, but does not say how it measures or whether it keeps 1% lows. Read how LeanFPS measures FPS.
Size and safety
LeanFPS is a single file of about 6.5 MB; the Radiant Optimizer v7.0.4 installer is 194 MB. LeanFPS never changes Defender, Memory Integrity, Windows Update or firewall settings, and saves the real previous value before every change. Our Radiant Optimizer alternative page covers what we found in an older Radiant installer, and five other tools.
Should you pick LeanFPS vs Radiant Optimizer?
Pick Radiant Optimizer if you want hardware monitoring, network tests, CPU and NVIDIA controls in one app and are fine with a final sale. Pick LeanFPS if you want a small app that tunes the game you are playing, proves the result with your own FPS numbers and can undo every change, and you can wait for the public release. You can also try both free versions, one at a time, and compare your 1% lows.
Sources
- Radiant Optimizer: radiantoptimizer.com home page (price, Windows 10 & 11, FAQ, FPS demo label), plans, refund policy and terms, read 2026-10-10. Official v7.0.4 download size checked 2026-10-10 (not run).
- LeanFPS: the app’s source repository and our pricing page.
LeanFPS vs Radiant Optimizer FAQ
Is LeanFPS cheaper than Radiant Optimizer?
LeanFPS Pro is $19 once at the early-bird price ($29 after the public release), against $57.77 once for Radiant Optimizer Premium. Both have a free version and neither is a subscription.
Which is better, LeanFPS or Radiant Optimizer?
Radiant Optimizer does more things: hardware monitoring, network and input tests, CPU and NVIDIA controls. LeanFPS does fewer things and measures them: it records FPS and 1% lows every session so you can see whether a tweak helped on your PC, and it never changes security settings. If you want the toolbox, Radiant fits. If you want proof and a small app, LeanFPS fits.
Do LeanFPS and Radiant Optimizer guarantee more FPS?
No. Radiant Optimizer’s FAQ says it cannot guarantee FPS, ping or hit registration, and LeanFPS does not promise a number either. Both depend on your hardware, your game and your starting settings.
Can I run LeanFPS and Radiant Optimizer together?
We do not recommend it. Both change the power plan and process priority, so they would undo each other. Undo changes in one before you start the other.
Try LeanFPS for free
Free to use with no account. The first three games you play get every Pro tweak, so you can compare your own FPS before you decide.