Lifetime deal vs monthly: the break-even maths, worked on every deal

Every deal on the SaaSChef menu gets two numbers the marketplace listing never shows you: how many months until the one-time price catches up with the subscription it replaces, and how many months of free cover are left after that. Get the first number wrong and you bought an expensive toy. Get the second number wrong and you skipped a genuinely good deal because the sticker price looked high. This is the formula we apply on every verdict page — on the TidyCal listing it is the "$0.65/mo equivalent, pays for itself in 12 months" line — with every current deal worked through below.

The formula

Three inputs, all printed on our deal pages:

• Offer price — the one-time cost of the licence.
• Normal monthly — what the vendor's own rolling plan costs per month, the honest comparison and not the inflated "original" list price.
• Term — the practical period the licence can be expected to cover, which for a lifetime deal is an estimate anchored to the vendor's funding, roadmap and category, not a promise.

Then:

• Monthly equivalent = offer price ÷ term.
• Break-even = offer price ÷ normal monthly, rounded up to whole months.
• Free months = term − break-even. If that is zero or negative, the deal never pays for itself inside its own expected life.

Worked example on real numbers: TidyCal's $39 licence against its own $3.30 monthly plan. $39 ÷ $3.30 = 11.8, so 12 months to break even. $39 ÷ 60 months = $0.65 per month of cover. Sixty minus twelve leaves 48 months — four years — of not paying the monthly bill.

The fastest break-evens on the menu

Short term, small price, expensive monthly plan: these pay for themselves almost immediately. Mailwright's $49 sequences licence against a $33.17 monthly plan breaks even in two months; SheetForge at $24.83 monthly breaks even in two; Deskhero in three; Snapmock, Linkvault and Screengrab Pro in three each. The catch is the column nobody prints: after break-even, three-month terms leave only nine months of free cover on a 12-month licence. Fast payback is worth little if the cover ends while you are still setting up.

The slowest break-even is the biggest win

TidyCal looks the least exciting by payback speed — twelve months before it beats the monthly plan — yet it tops the menu at 9.1/10. The reason sits in the other column: 60 months of term minus 12 months of break-even leaves 48 free months, and the $0.65 monthly equivalent is the cheapest cover per month of anything we have tested. Kanbanly is the same story: $29 against a $3.71 monthly plan, break-even at eight months, then 40 free months. When you price that out, the "expensive-looking" long-term deals are the ones that actually save money.

The savings table

Savings are computed as (normal monthly − monthly equivalent) × term — what you keep compared with paying the vendor's rolling plan for the same cover. Every figure below comes from the tested deals on the current menu, prices as checked in September 2026.

Deal	Offer	Monthly equiv.	Term	Break-even	Free months	Total saved
TidyCal	$39	$0.65	60 mo	12 mo	48	$159
Kanbanly	$29	$0.60	48 mo	8 mo	40	$149
Brandpad (in the kitchen)	$89	$2.47	36 mo	7 mo	29	$409
Metricsprout	$69	$1.92	36 mo	7 mo	29	$329
Inkwell AI	$59	$1.64	36 mo	8 mo	28	$239
SheetForge (in the kitchen)	$49	$4.08	12 mo	2 mo	10	$249
Pipedrive Lite (in the kitchen)	$39	$1.63	24 mo	4 mo	20	$199
Copyforge	$49	$2.04	24 mo	5 mo	19	$209
Wavecast	$79	$3.29	24 mo	5 mo	19	$319
Formwise	$59	$2.46	24 mo	5 mo	19	$259
Mailwright	$49	$4.08	12 mo	2 mo	10	$349
Deskhero	$59	$4.92	12 mo	3 mo	9	$239
Snapmock	$29	$2.42	12 mo	3 mo	9	$129
Linkvault	$39	$3.25	12 mo	3 mo	9	$159
Screengrab Pro	$25	$2.08	12 mo	3 mo	9	$113

Three ways the maths lies

The formula is honest; the inputs are where deals go wrong.

• The "normal" price is not always the honest comparison. Some vendors list a headline monthly price next to a discount "original" figure. Compare against what the plan actually costs today, which is what our normal-monthly figure uses. A break-even computed against the inflated price is fiction.
• The term is a guess, and graveyard entries prove it. Our Graveyard keeps every deal that was re-priced, restricted or pulled after purchase — eight tiers from this quarter alone. When a term is cut in half a year after you buy, both the monthly equivalent and the free months move. That is why long-term deals from vendors with a re-cut history — Inkwell's original tier, Linkvault's pre-pivot listing — are scored down even when the arithmetic looks generous.
• Break-even assumes you would actually pay monthly. If you would use the free tier instead, or use the tool twice a year, the true baseline is zero, not the vendor's plan price, and no lifetime deal breaks even against that. The maths only works for tools you genuinely use weekly.

The takeaway

Do not compare a lifetime deal with the subscription by feel. Work out the break-even in months, work out the free months left after it, and then decide whether the vendor is likely to survive both. The scored menu applies this to every deal we have tested; the graveyard write-up covers what happens when the assumptions fail, and the tier-by-tier cost per month of cover applies the same arithmetic one tier at a time.