The last calculator
you'll ever subscribe to.
Arithmetic, reimagined for the modern pricing era. Try it now — addition's on us.
The product
Take a closer look.
Every detail is deliberate. Every restriction is documented. Every key has a reason.
Display
Tabular numerals.
Your results don't dance when you type. Every digit takes the same width. As mathematics intended.
Tier badge
Always visible.
You'll never wonder what plan you're on. The badge above the display tells you, gently, every time.
Daily counter
5 free results.
Free accounts get five = presses per day. We think that's plenty for the kind of math you're doing.
Locked keys
Honest about it.
Buttons you don't have access to still appear, with a small lock. We won't pretend they don't exist.
Four operators. Five tiers.
Smooth operator,
meet your pricing page.
Every key earns its tier. Scroll to see which one each operator lives on.
Addition
On the house.
Every Accumulatr account starts with the operator that built civilization. No upsell, no asterisk.
- · Included with Free
- · Works with digits 1–9
- · Up to 5 results per day
Free — $0/mo
Subtraction
For people ready to take something away.
Once you've added enough, subtraction is the natural next step. Pro unlocks the minus key — and the digit 0 you'll need to use it well.
- · Included with Pro and above
- · Pairs nicely with the digit 0
- · Try free for 7 days
Pro — $1.99/mo
Multiplication
Power users only.
Repeated addition, productized. Multiplication is bundled with Pro because, frankly, you've earned it by now.
- · Included with Pro and above
- · Unlimited = presses
- · Calculation history (last 10)
Pro — $1.99/mo
Division
Ultra territory.
Division is the most demanding of the four operations. We treat it accordingly. Fair-use policy applies, because of course it does.
- · Included with Ultra and above
- · Light mode unlocks here too
- · No ads, unlimited decimals
Ultra — $4.99/mo · fair use policy applies
Scientific
By request only.
Trigonometry, exponents, parentheses. Available as a $2.99/mo add-on for Ultra subscribers. Total: $7.98/mo, which we feel is reasonable.
- · Requires active Ultra subscription
- · Includes sin / cos / tan, x², √, π
- · Add-on is cancellable any time
Ultra + Scientific — $7.98/mo
Some people just get it.
One payment. Every feature. Every platform. Forever.
$99
A TI-84 also costs $99. Just saying.
TI-84
$99 once
Accumulatr
$99 once
- Calculator
- Calculator in the cloudnot reallyin the cloud
Comparison chart · v1.0
Active account required. See Terms.
A plan for every level of mathematical ambition.
- Free$0
- Pro$1.99/mo
- Ultra$4.99/mo
- Scientific Add-on(Ultra required)$2.99/mo
- Founder$99 one-time
- EnterpriseContact Sales
Five questions
Help me choose.
Answer honestly. We'll suggest a tier. You can ignore us.
Do you ever need to subtract?
Try everything.
Commit to nothing.
Start a free 7-day trial and access all Pro features — including the digit 0 — with no credit card required. One trial per account.
After 7 days, you'll return to Free. Addition will still be there.
Together, we can unlock more.
Apple charges us $99/year to enable Sign in with Apple. One Founder purchase covers it for everyone.
0 of 1 Founder purchases this year
Resets January 1st. We'd rather not pay for it alone.
Ready to add?
Subtraction is right there waiting.
Free forever. Pro features available for 7 days. No credit card required.