WFSim is the ultimate Warframe calculator — builder, simulator, optimizer. True to in-game numbers, down to the last proc. Theorycrafting, solved.
Weapons
Support WFSim
WFSim is free and open source. No ads, and no feature will ever be locked behind a payment — that part is not going to change. It does cost money and time to run, so if it saved you a Forma, you can chip in.
Where it goes
The wfsim.app domain, and its renewal.
Cloudflare — the bandwidth and build minutes that serve the app and its art from one origin.
Time: new weapons, new mechanics, and the in-game measurements every golden test is calibrated against.
$5 to start, and after that whatever you think it is worth. There is no tier and no target — this is what the bill is, not a price list.
What a donation never buys
No paid features and no paywall. Every build, simulation and search stays the same for everyone.
No tiers, no perks, no supporter badge. A donation is a thank-you, not a purchase.
No ads, and no tracking beyond what Cloudflare counts to serve the page.
No influence on the numbers. An in-game measurement is the only thing that changes what the engine does.
Free, and worth more
Report a number that disagrees with your own in-game measurement. That is the one contribution nothing else can replace — every formula here is calibrated against a real run, and a discrepancy is a bug report on reality.GitHub Issues · QQ group · Discord
Star the repository, or send a build link to someone who is still doing this by hand.github.com/magenie33/wfsim
A donation supports this site's running costs and nothing else — it is not a purchase, and nothing on this site is for sale.
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1
Mods
0 / 600 Forma
Exilus
2
Arcane
3
Evolution
Incarnon Genesis
4
Element
configurable element
Σ
Stats
≡
Build
▶
Sim
Tenno
Enemy
1 · The fight who you are shooting at, where, and for how long
2 · The wielder whoever is holding the weapon and what they are doing — this gates the buffs below
3 · Limits what this run is allowed to assume
4 · Buffs the stacks the run STARTS with — the fight still grants and decays them on their own triggers
5 · Simulation how many times to replay it, and what to read off — the optimizer's final round uses the same count
Σ
Result
4
Rivens
All rivens every riven you have made for this weapon, with what it actually rolls
⚙
Optimize
what to search, and how hard — the fight is the simulator's
Mods search by name or effect; mark each as pool (search) or required
Exilus slot the +1 slot — pool = slot options, req = pin one; nothing marked = the slot stays empty
Arcanes pool = searched options, req = pin the slot
Evolutions per tier: pool = searched options, req = pin
Search how many winners to keep, and how much of the machine to spend — the final round runs each of them at the fight's own run count
The fight read-only — it belongs to the simulator, which is where it is edited
The Tenno must match how you intend to play it — the winner is scored under this player
Limits what the search is allowed to assume
Buffs read-only — the fight's own, applied to every candidate; a buff nobody set starts where it would in a fight