Polar Review

Polar (polar.sh) is an open-source merchant of record and billing platform for developers selling software, SaaS subscriptions and digital products. It is run by Polar Software, Inc., a Delaware corporation whose team is based in Stockholm, and was founded in 2022 by Birk Jernström, who co-founded the e-commerce platform Tictail, sold it to Shopify in 2018 and then led product for Shopify's Shop app. Polar launched version 1.0 of its billing platform in September 2024 and raised a $10 million seed round led by Accel in June 2025, with angels from Shopify, Vercel, Supabase, Raycast, Resend and Framer. As merchant of record it is the legal seller of everything sold through it — it collects and remits US sales tax, EU VAT, Canadian GST and other taxes, carries chargeback liability and issues the invoices — and it charges a single platform fee on top of that. That fee changed on 27 May 2026. Organisations created before that date keep an 'Early Member' rate of 4% + 40¢ plus 0.5% on subscriptions indefinitely; new organisations pay 5% + 50¢ on the free Starter plan or buy down the rate with Pro ($20 a month, 3.8% + 40¢), Growth ($100, 3.6% + 35¢) or Scale ($400, 3.4% + 30¢). International (non-US) cards add 1.5%, disputes cost $15 each regardless of outcome, payouts go through Stripe Connect at Stripe's pass-through fees ($2 per active payout month, 0.25% + 25¢ per payout), and organisations created on or after 12 May 2026 have a seven-day settlement delay before they can withdraw. Its code is Apache 2.0 on GitHub, its SDKs and framework adapters are widely praised, and its weak points are the ones you would expect of a seed-stage company two years into operating: thin support, fixed dunning you cannot customise, and pricing for newcomers that is now level with Paddle and Lemon Squeezy rather than below them.

Estimated annual cost at three realistic processing volumes, using Polar’s published online rate plus monthly fees. Real costs vary with average transaction size, chargeback rate, and any negotiated terms.

What it is

Polar is a merchant of record and billing platform aimed squarely at developers. Its pitch is that a software seller should be able to add global payments, tax compliance, subscriptions, usage-based billing and digital delivery to an application with a few lines of code and let Polar be the legal seller. The company behind it is Polar Software, Inc., incorporated in Delaware with its team in Stockholm, founded in 2022 by Birk Jernström. Jernström co-founded Tictail, an e-commerce platform that grew past 100,000 merchants before Shopify acquired it in 2018, and then ran product for Shopify's Shop app. Polar's platform reached version 1.0 in September 2024, and in June 2025 the company announced a $10 million seed round led by Accel with continued backing from Abstract and Mischief and a long list of developer-tooling angels — Tobi Lütke and Harley Finkelstein of Shopify, Guillermo Rauch and Jared Palmer of Vercel, Paul Copplestone of Supabase, Zeno Rocha of Resend, Thomas Paul Mann of Raycast, and the founders of Framer, Dub, WorkOS, Lovable and Nuxt. At the time it claimed thousands of developers on the platform, more than 17,000 sign-ups and revenue growing over 120% month on month on average across the previous six months; the code is public on GitHub under the Apache 2.0 licence, where it has about 10,300 stars as of September 2026.

How the merchant-of-record model works here

Under Polar's Master Services Terms, effective 25 March 2026, a seller appoints Polar as its non-exclusive reseller across all territories, and Polar sells the product to the end customer in its own name. That makes Polar responsible for the parts of selling software internationally that most small teams get wrong: registering for, collecting and remitting US sales tax, EU VAT, Canadian GST and other consumption taxes; issuing compliant invoices; handling refunds; and carrying liability for chargebacks. Payments are processed through Stripe, and Polar passes the seller its share after the platform fee. The model's cost is control. Polar decides what it will sell — its terms let it reject anything outside its acceptable-use policy or its risk tolerance — and it may establish or increase a reserve, delay or suspend payments on risk factors such as chargeback rates, with delays of up to 120 days for suspended sellers or high-risk transactions. It may also refund a customer itself, within ten days of a one-off purchase or 30 days of a subscription renewal, if it decides that is in both parties' interest. None of this is unusual for a merchant of record; Paddle and Lemon Squeezy reserve the same rights. It is worth reading before treating Polar as a drop-in replacement for a Stripe account you control.

Pricing, before and after May 2026

For most of its life Polar sold itself on one number: 4% plus 40¢ per transaction, with 0.5% added on subscription payments, no monthly fee, and everything included. On 20 May 2026 it announced Polar Plans, and from 27 May the pricing became tiered. New organisations on the free Starter plan pay 5% plus 50¢; Pro, at $20 a month, charges 3.8% plus 40¢; Growth, at $100 a month, 3.6% plus 35¢; and Scale, at $400 a month, 3.4% plus 30¢, with no subscription surcharge on any of the new plans. Polar's explanation was that 'the cost of free to us has been increasing' and that published tiers are more honest than opaque volume discounts. Organisations created before 27 May 2026 keep the Early Member rate of 4% plus 40¢, plus 0.5% on subscriptions, indefinitely — but upgrading to a paid plan ends it permanently, and downgrading afterwards lands on the new Starter price. The arithmetic for a new seller is simple: Pro pays for itself against Starter at roughly $1,700 a month in sales and Growth at roughly $7,000 (both before the per-transaction saving), and below those thresholds the free tier now costs exactly what Paddle and Lemon Squeezy charge.

The headline rate is not the whole cost. International cards — meaning non-US — add 1.5%. A dispute costs $15, deducted from the balance whether or not you win it. Refunding a customer does not refund Polar's fee, because the networks and processors keep theirs. Payouts run through Stripe Connect at Stripe's own prices, which Polar passes through without markup: $2 for each month in which you take a payout, 0.25% plus 25¢ per payout, and currency conversion of 0.25% inside the EU or up to 1% elsewhere. Withdrawals are manual, which Polar frames as letting sellers batch them to avoid the per-payout charge, and minimums run from $10 in USD to about $40 in most other currencies. Organisations created on or after 12 May 2026 have a seven-day settlement delay before funds become available; earlier organisations still receive instant availability. Polar may extend the delay to match a seller's refund policy or for compliance reasons, and a payout requested while an account is under review is held until the review clears.

The product

The reason developers put up with the fee is the product. Polar offers hosted and embedded checkout, subscriptions, metered and usage-based billing driven by event ingestion, a customer portal, and a set of 'benefits' that are granted automatically on purchase — licence keys with validation and activation limits, file downloads, private GitHub repository access, Discord roles and custom entitlements. Official SDKs cover TypeScript, Python, Go and PHP, and maintained framework adapters exist for Next.js, Nuxt, TanStack Start, Laravel and Better Auth — the older SvelteKit, Hono, Express, Remix and Astro adapters are now marked deprecated — so a checkout route or webhook handler is a few lines rather than a project. Reviewers consistently praise the documentation and the speed of getting to a first sale. The main product complaint is the other side of that simplicity: failed-payment recovery is a fixed flow — four retries at 2, 5, 7 and 7 days, 21 days in all, with Polar's own emails — and while a seller can choose how long benefits stay active during that window, the retry cadence and the messages cannot be changed, where Stripe and Paddle let a seller own the dunning process. And although the code is open source, a seller cannot self-host it to become their own merchant of record; the licence is for inspection and contribution, not for running your own Polar.

Support and reputation

Polar is two years past its 1.0 and still a seed-stage company, and the reputation reflects that. Developer reviews through 2026 rate the platform highly on integration and pricing transparency and poorly on support: the channels are email, documentation, GitHub and Discord, there is no phone line or SLA, and community threads describe slow or unanswered tickets — one widely shared thread from February 2026 was titled to the effect that Paddle was slow and Polar unresponsive. That matters more with a merchant of record than with a gateway, because the seller cannot reach the underlying processor when funds are held. On the other hand, there is no consumer-review pile-up of the kind that surrounds Lemon Squeezy, no enforcement history, and the company's public conduct — publishing every fee, grandfathering early users, keeping the code open — has earned it goodwill in the developer community that the price change only partly spent. We found no lawsuit, settlement or regulatory action naming Polar Software, Inc.

Who it suits

Polar is a good fit for an independent developer or small SaaS team selling globally who would rather pay a percentage than run tax compliance, and who values the SDKs, usage-based billing and digital-delivery features enough to accept a fixed dunning flow and email-only support. An Early Member account is still the best-value merchant of record for small sellers, and the paid plans make Polar the cheapest of the published-rate MoRs once monthly sales pass a few thousand dollars. A new seller at low volume should compare Paddle and Lemon Squeezy on features rather than price, since the rate is the same. A business that needs next-day funds, a phone number, or control of its recovery emails should look at a Stripe account with a tax add-on instead.