Opportunities › Database migration tools for legacy systems › Proposed app
Plainport
Plan, rehearse and check a SQL Server to PostgreSQL move, Dapper queries included
- Score
- 40
- confidence 38
- Evidence
- 3
- items on the page
- Rivals
- 0
- named in sources
- First version
- 70 d
- estimate
- Type
- Desktop app
- PWA: runs in the browser, installs on Mac and Windows
- Market since
- 2005
- Mature market · AI estimate
ScreensConcept
Desktop app: Engineering teams work through complex migration planning, query review, and technical analysis at a desk over long sessions. Sample screens on a computer, in the proposed brand. Their numbers are sample data.
Assessment
Ready to rehearse82% auto
About this appAI proposal
Plainport helps small engineering teams move a SQL Server database to PostgreSQL without a long, risky project. It reads your schema, translates it, copies the data in checked batches, and flags the SQL in your code that will not run unchanged on PostgreSQL.
It is built for teams with older SQL Server systems that use Dapper, where queries live as plain strings in the code. Plainport finds those strings, proposes PostgreSQL versions, and shows what needs a human decision.
Every step can be rehearsed on a copy first. Row counts, checksums and query results are compared, so you see what differs before cutover, not after. Plainport suggests changes; your team reviews and approves each one.
- Tagline
- Move to PostgreSQL with fewer surprises.
- Voice
- CalmPrecisePractical
- Why this name
- Plain and short: a port is where you cross over, and the name hints at porting to Postgres without borrowing any product's name.
In the first version
Members say which features they would use. It tells PWAS what people want; it changes no score.
Schema translation
Converts tables, keys, indexes, defaults and types to PostgreSQL, with a plain list of anything it could not map.
No member yet
Dapper query scanner
Scans C# repositories for SQL strings, suggests PostgreSQL rewrites as diffs, and marks T-SQL-only syntax for review.
No member yet
Checked data copy
Copies data in batches with resume after failure, and compares row counts and checksums per table.
No member yet
Text and index report
Shows how string columns, collations and encodings will behave in PostgreSQL, and which indexes are affected.
No member yet
Brand identityAI proposal
Check the name against trademark registers before using it.
Palette
#1F5F5BHarbor Teal · primary#F6F3ECPaper · surface#1F2A2ESlate Ink · text#D9822BSignal Amber · accent#3B6EA5Tide Blue · data#B3402FBrick · warning
Typography
Aa
Plainport
PricingAI proposal
The material gives no competitor prices. These tiers are a starting point to test, following the per-migration and subscription ideas in the opportunity.
Assess
Free
- Schema and Dapper query scan
- Effort estimate report
- One small database
Migration
$1500 once
- One database, unlimited rehearsals
- Query rewrites and diffs
- Checked data copy
- Cutover checklist
Team
$400 a month
- Several databases
- Shared review of flagged queries
- Email support
Would you pay Team · $400 a month?
Your answer tells PWAS which prices people accept. It changes no score.
No answers yet.
What it could be worthEstimate
What a software business making this much sells for today, from real deals. Pick a monthly revenue.
If it makes
Worth about
$194,000
Sale range $132,000 to $263,000
$120,000 a year in revenue
From 87 software businesses listed and sold on Empire Flippers in the last year, revenue vetted by the broker: they sell for about 19× their monthly revenue, most between 13× and 26×.
Measured on profit, the middle deal is 32× monthly net profit: about 2.7 years of profit.
An estimate, not an offer or financial advice. A real price depends on profit, growth, churn, how much of the work is the owner's, and the buyer.
How it would growAI proposal
How the product would reach new customers through its own use, and how the first ones would be found. A plan to test, not a result.
- Built-in loop
- Shared outputs. Assessment and validation reports can be shared as links with managers, auditors and colleagues who do not use Plainport, showing effort and the checks that passed.
- Do they become customers?
- Report readers are often the budget holders, so some may become buyers. That is untested: check whether shared reports lead to sign-ups or paid migrations.
- First customers
- Engineering leads at small .NET software companies, 10 to 100 staff, running one SQL Server database with Dapper and feeling its cost or performance limits.
- Where to reach them
- Hacker News and developer forums: Post a free assessment tool and write-ups on SQL Server to PostgreSQL gotchas, such as text handling and indexes.
- .NET community groups: Offer free assessments to Dapper users in meetups, newsletters and open source discussions.
- Direct outreach: Contact .NET teams that publicly discuss database cost or performance problems and offer a rehearsal.
- First milestone
- Ten free assessments run, then three paid migrations from .NET teams within 90 days.
Why people already pay for this
- Public claimOrganizations are trapped in legacy database systems they recognize as inferior, unable to migrate due to prohibitive costs.
- Public claimSQL Server has performance issues with string handling that impact database indexes.
- AI inferencePostgreSQL is recognized as a superior alternative that defaults to better configuration (UTF-8 encoding).
Tech stack
Every proposal builds on the same PWA base, installable from the browser on any phone or computer. Dashed boxes are what this app adds.
- AppNext.js and TypeScript
- PWAManifest and service worker
- UITailwind CSS
- Data and authSupabase Postgres
- PaymentsStripe
- EmailResend
- HostingVercel
- This app · Migration agentContainerised worker run inside the customer networkDatabases are usually not reachable from the internet, and long copies need to run outside a web request.
- This app · SQL parsingT-SQL and PostgreSQL parser libraryReliable query and schema rewriting needs a real parser, not pattern matching.
RisksAI inference
- TechnicalT-SQL has many features without direct PostgreSQL equivalents, such as procedures, temp tables and hints. Automatic coverage may stay well below what teams hope for.
- CommercialMigrations happen once per customer, so revenue is lumpy. The Team tier and ongoing value after cutover would need to be tested.
- DataCustomers must give access to production-like data. Security reviews could slow sales, so data should stay inside their network.
- AIIf AI helps rewrite queries, a wrong rewrite could change results silently. Result comparison and human approval must stay mandatory.
- CommercialOnly a public claim supports the demand here, and no competitors are named. Willingness to pay is unproven and must be tested with real teams.
Everything marked AI proposal or AI inference was written by a model from the evidence on the opportunity page. The proposed name must be checked against trademark registers before it is used.