CRM and sales decision
gosimless
A single developer can build a narrow replacement that provisions numbers, routes SMS-to-email and exposes a portal (using Twilio/Stripe), but reproducing gosimless’s global number inventory, carrier relationships, support for verification edge-cases, and operational scale is non-trivial and outside one-person scope.
Visit website↗Not priced
No pricing page we fetched carried a figure, so there is nothing to compare against. The build side is still real.
$100one-off80 h to build
$40/mo6 h/mo upkeep
No published price to break even against.
No open-source build does this yet
Nothing published replaces this one, so a replacement starts from an empty file. Here is what it would have to cover.
What a replacement has to do
- Purchase or provision a virtual phone number, route inbound SMS to an email inbox and web UI, allow call-forwarding configuration, and provide logs/CSV export via a control panel.
What it still won’t have
- Global number inventory and carrier relationships (scale/coverage)
- Established support and hand-holding for verification edge-cases (WhatsApp shortcodes, alphanumeric senders)
- Brand trust and existing customer base
- Operational telephony compliance, fraud detection, and negotiated call/SMS rates
What remains hard
- Product polish and ongoing maintenance
First-year cost
No published price
gosimless does not publish a price we could read, so there is nothing to compare against. What building costs is below.
Money you would actually spend
Time you would spend
—
What you would spend
What we assumed
The verdict above measures whether you could build it. This one is only about money.
Runnable build prompt
Build a minimal virtual-number service using Next.js + TypeScript for the frontend, Node.js (Express) backend, Postgres for logs, and Twilio (or similar) for telephony. Core features in scope: user signup/login (email), purchase/provision a UK or US virtual number via provider API, receive inbound SMS webhooks and forward messages to a configured email (SMTP/SendGrid), searchable SMS & call logs with CSV export, basic call-forwarding configuration, and billing for number subscriptions (Stripe). Out of scope: negotiating carrier contracts, multi-country number inventory beyond UK/US, and compliance/legal review. Include input validation, error handling, retry for webhook processing, unit tests for API handlers, and an integration test that simulates inbound SMS webhook to end-to-end email delivery.
How we checked
How the score was reached
- Partly verdict base52
- 2 cited sources+1
- 3/3 assessment runs agreed+4
- Evidence score57
The base comes from the verdict. Everything under it is a check that either happened or did not, and each one is a fact frozen in this record rather than a judgement made at render time - so the same evidence always produces the same number.
How scoring works →Cited sources · 2
Every page the run actually retrieved.
- official productgosimless — official site
- official pricingIs eSIM Available in UK? Networks, Plans & Costs
Integrity checks
What held up, and what did not.
