Compare validation APIs
We list the real starting prices and the real gaps, including ours. Pick the tool that fits.
Twilio Lookup
Twilio's phone intelligence API, bundled into the Twilio console. Line type intelligence, caller name, SIM swap and SMS pumping risk as separate paid packages.
Numverify
Phone validation API with country, carrier and line-type fields. Its pricing page advertises real-time carrier detection; test portability behavior on your own sample.
IPQualityScore
Fraud scoring platform with phone, email and IP reputation APIs. Strong on proxy and VPN detection and on risk scores.
ZeroBounce
Email verification with bulk list cleaning, an API, and deliverability add-ons such as inbox placement tests.
NeverBounce
ZoomInfo-owned email verification with bulk cleaning, an API and a Javascript widget for forms.
Hunter Email Verifier
Email finding, verification and outreach tools, with subscription and separate data-platform options.
Best Hunter Email Verifier alternatives
LookupLab vs Hunter Email Verifier
Abstract API
Phone, email and IP APIs with separate pricing and response tiers. Evaluate the fields included in the plan you choose.
ipapi
IP geolocation API with a generous free tier, aimed at developers who need country and city for an IP.
IPinfo
The reference IP data provider. Geolocation, ASN, company, carrier and privacy detection sold as separate datasets and API plans.
Kickbox
Email verification focused on deliverability, with a Sendex quality score and a strong stance against list-bombing abuse.
MillionVerifier
Budget bulk email verifier popular with cold email teams. Credits never expire and prices are among the lowest per email.
Best MillionVerifier alternatives
LookupLab vs MillionVerifier