Email verification services compared

Where it bites: every pass is a fresh credit purchase, and the flat-rate Unlimited plan starts at $799 a month only on a 12-month commitment billed upfront ($999 a month on 3 months).

Where it bites: every pass is another credit purchase, so a list re-checked every month is paid for again each time, and from 50,000 credits ($44.95) one pass costs more than a month of Pro.

Where it bites: verification is billed per email at $0.003 up to 500,000, so a 100,000-address list is a $300 job each time you run it.

Where it bites: every re-check is billed again from the credit balance, so a list you clean monthly is bought again each month.

Where it bites: every pass is another credit purchase, so a list you re-check every month is paid for again each time, and from 50,000 a month its monthly plan ($44.20) costs more than a month of Pro.

Where it bites: verification is billed per email, so cleaning a large list is a variable cost you cannot forecast from the plan price.

Where it bites: it is billed per verification, so a 100,000-address list costs $400 each time it is cleaned.

Where it bites: every pass is another pack, so a list you re-check every month is paid for again each time, and from 250,000 addresses ($65) one pass costs more than a month of Pro.

Where it bites: credit-based pricing means the second pass over a list costs the same as the first.

Where it bites: the allowance is a credit count, so 100,000 a month is $194 on a plan or $212.80 as a pack, and the page says purchases cannot be refunded.

Where it bites: the allowance is a credit count, so 100,000 a month is $89 on a plan or $99 as a pack, and its FAQ says it never stores a result, so every re-check of the same list spends credits again.

Where it bites: every pass is another pack, so a list of 100,000 re-checked every month is $49.50 every month, more than a month of Pro.

Where it bites: the subscription is a daily allowance that does not carry over, so a large list either waits for days of credits or is bought again as an instant pack.

Where it bites: its published tiers stop at 15,000 emails, so a larger list has to be priced separately.

Where it bites: prices climb steeply with the volume tier: 10,000 checks a month is $88.40 and 100,000 is $468.

Where it bites: the plans are daily allowances that expire at midnight, so a large list either waits for days of credits or is bought as a pack, and High or Extreme quality doubles or quadruples the credits per address.

Where it bites: the per-email price is high at volume: 10,000 credits are $49.95 and 100,000 are $399.95, bought again for every pass.

Where it bites: it is metered per credit, so a growing sign-up flow or a bulk clean moves you to the $34.99 or $94.99 tier.

Where it bites: it is priced per credit, so cleaning the same list twice costs twice.

Where it bites: every pass is another pack, and from 10,000 credits ($40) one pass costs more than a month of Pro; 100,000 credits are $250.

Where it bites: every option is metered by the credit, so every pass over the list is billed again — the cost scales with how often you clean, not just how much.

Where it bites: past 10,000 a month the tiers climb quickly: 25,000 is $79 a month and 100,000 is $229.

Where it bites: it is an API quota, not a list tool, so cleaning a CSV means writing the batching yourself and every row counts against the month.

Where it bites: it has no plan between 10,000 and 100,000 a month, so 25,000 a month is a $40 pack or the $79 Professional plan, and 1,000,000 a month is $299.

Where it bites: plan allowances reset each billing cycle and do not roll over, and 100,000 a month is $69 on its Business plan or $99 as a pack.

Where it bites: the allowance is the ceiling — a list past it pushes you up the tiers, and a 100,000-address clean is a $186 pay-as-you-go job.

Where it bites: the allowance is a credit count, so a list re-checked every month spends credits again each time, and at 100,000 a month its plan is $64.

Where it bites: the plan is a request quota, so a bulk clean and your live sign-up checks compete for the same allowance.

Where it bites: subscription credits reset every month, so an allowance you did not use that month is gone.

Where it bites: finding and verifying share one credit pool, so heavy verification draws down the credits you meant for finding.

Where it bites: the allowance is a credit count, so 100,000 a month is $99 on Business and $159 as a pack, and every re-check of the same list spends credits again.

Where it bites: each package is one pass, so 100,000 addresses are $200 every time the list is checked, and the pricing page does not say whether credits expire.

Where it bites: the monthly-billed price is far above the annual one — 10,000 a month is $58 billed monthly against $32 a month billed yearly — so the low headline needs a year's commitment.

Where it bites: the allowance is a credit count, so 100,000 a month is $149 on a plan or $199 as a pack, and subscription credits reset each cycle below its 500,000-credit tiers.

Where it bites: the plan is sized by monthly volume, so a list that grows pushes you up a tier whether or not the extra addresses are worth checking.

Where it bites: verifying addresses from elsewhere costs 0.2 credits each from the same pool you use for finding, so a big clean eats your prospecting allowance.

Where it bites: every plan, including one-time bulk plans, is listed with 30-day validity, so queries you bought and did not use do not wait for you.

Where it bites: 100,000 email credits are $236 as a pack or $212.40 a month, pack credits lapse 365 days after purchase unless extended, and subscription credits do not carry over to the next month.

Where it bites: it is priced per credit, so the bill scales with the list: 100,000 a month is $357 even with the subscription discount, and every re-check is billed again.

Where it bites: its packs are priced for catch-all work, $40 for 10,000 and $300 for 100,000, so a list that is mostly ordinary domains pays catch-all rates on every address, again on every pass.

Where it bites: every pass is a fresh purchase, so a list you re-check monthly is bought again each time.

Where it bites: unused credits expire every 30 days on a monthly plan, and finding and verifying draw on the same pool.

Where it bites: the jump from 2,000 to 50,000 credits is a jump from $39 to $349 a month, with nothing published in between.

Where it bites: the plans stop at 100,000 credits for $497 a month, Deep Verification spends 3 credits per address, and its pricing page says all purchases are final, with no refunds for unused credits.

Where it bites: credits expire, so an allowance bought for a campaign that slipped a quarter is simply gone.

Where it bites: verifications draw half a credit each from the same pool you use for finding, and on monthly billing unused credits reset every month.

Where it bites: past the allowance, validations are billed as overage from $1.20 per 100 on the Pilot plan, so a big list clean is mostly overage.

Where it bites: the verification allowance is half the plan's credits, so 50,000 verifications a month needs the $449 plan.

Where it bites: rollover is capped at twice the monthly allowance, so a quiet quarter loses credits.

Where it bites: verification costs a full credit from the shared pool, and unused credits expire when you cancel.

Where it bites: email validation alone is $70 a month up to 10,000 and $400 a month up to 100,000, and above 250,000 the price is not published.

Where it bites: validation is only included from the Pro email API plan up, so a team that wants to clean a list pays for a sending tier it may not need.

Where it bites: credits are the unit, so the bill scales with list size and a re-verification of the same list costs full price again.

Where it bites: rollover on monthly plans is capped at two months, and annual credits refresh yearly without rolling over.