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3.6/5.0
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Bisimia

TLA+ development and verification environment directly in the browser.

Pricing

Contact

Contact Sales
Score

3.6/5

Last technical review
2026-11-06
Available plansVisit website (opens in a new tab)

Technical Overview

Bisimia is a web-based integrated development environment for formal system verification using TLA+. It enables software engineers to write specifications, execute model checkers, and explore counterexamples without complex local setups. Designed for accessibility, this service streamlines the formal verification lifecycle for critical infrastructure projects.

Analyst Evaluation: Pros and Limitations

Verified Advantages

  • Full TLA+ execution in the browser without local configurations.
  • Facilitates rapid exploration of counterexamples via a visual interface.
  • Eliminates the friction of installing heavy dependencies for formal verification.

Technical Considerations

  • Lack of team collaboration or project management features.
  • Browser-based deployment limits the processing of extremely large specifications.

Technical Capabilities & Features

1/7
Not available:REST & GraphQL API
Not available:SSO / SAML Authentication
Not available:Self-Hosted Option
Included:Full Data Export
Not available:Role-Based Access Control (RBAC)
Not available:Custom Domains & SSL
Not available:Immutable Audit Logs
Scorecard
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Technical Scorecard: Bisimia

65/100
DX & Tech Documentation
Favorable
70/100
Pricing Fairness
Improvable
50/100
Security & Governance
Favorable
60/100
Data Portability & Sovereignty
Favorable
70/100
Performance & Reliability
Favorable
75/100

Time to Value & Fit by Segment: Bisimia

Estimated Time-to-Value< 1 hour (Immediate)

Near-instantaneous deployment with minimal technical friction.

Learning CurveModerate (Standard)

Requires consulting technical documentation and basic credentials setup.

Fit Index by Organization Size

Startup & Agile Teams1 to 50 members
30%
Mid-Market & Scaleup50 to 500 members
20%
Corporate Enterprise500+ members
10%
Pricing & TCO
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Pricing

Contact Sales/mo

Model: CONTACT.

Get Bisimia (opens in a new tab)

Billing Risks & Hidden Clauses: Bisimia

Free Tier Limits:

No public pricing available.

Total Cost of Ownership (TCO) Projection: BisimiaCONTACT
Deterministic cost estimation at 12 and 36 months based on team size, including SSO tax premiums and annual prepay discounts.
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Indie / Solo (1 active user)

Solo developer or independent technical founder.

Base Monthly Cost
$12/month
1 active user
12-Month Investment
$122/year
Includes ~15% savings via annual billing
3-Year TCO Projection (36m)
$366total
Consolidated software licensing expenditure

Estimated Self-Hosted VPS + DevOps Cost

Break-Even Point: Profitable starting at 3 active users

Calculated infrastructure: VPS 1 vCPU / 2GB RAM (~$5) + 0.5h DevOps/mes ($20)

Annual VPS + DevOps Cost$300/year
Differential vs SaaS LicensingSaaS is $178/year
Startup (10 active users)

Agile engineering team in validation and early traction stage.

Base Monthly Cost
$120/month
10 active users
12-Month Investment
$1,224/year
Includes ~15% savings via annual billing
3-Year TCO Projection (36m)
$3,672total
Consolidated software licensing expenditure

Estimated Self-Hosted VPS + DevOps Cost

Break-Even Point: Profitable starting at 10 active users

Calculated infrastructure: VPS 2 vCPU / 8GB RAM (~$15) + 2h DevOps/mes ($80)

Annual VPS + DevOps Cost$1,140/year
Differential vs SaaS LicensingSavings of $84/year
Growth (25 active users)

Scaling company with team governance and granular access control requirements.

Base Monthly Cost
$300/month
25 active users
12-Month Investment
$3,060/year
Includes ~15% savings via annual billing
3-Year TCO Projection (36m)
$9,180total
Consolidated software licensing expenditure

Estimated Self-Hosted VPS + DevOps Cost

Break-Even Point: Profitable starting at 28 active users

Calculated infrastructure: Cluster VPS 4 vCPU / 16GB RAM (~$45) + 6h DevOps/mes ($240)

Annual VPS + DevOps Cost$3,420/year
Differential vs SaaS LicensingSaaS is $360/year
Scaleup (100 active users)

Established organization with enterprise security policies and mandatory SAML/SSO.

Base Monthly Cost
$1,200/month
100 active users
12-Month Investment
$12,240/year
Includes ~15% savings via annual billing
3-Year TCO Projection (36m)
$36,720total
Consolidated software licensing expenditure

Estimated Self-Hosted VPS + DevOps Cost

Break-Even Point: Profitable starting at 78 active users

Calculated infrastructure: Infraestructura HA redundante + Backups (~$150) + 16h DevOps/mes ($640)

Annual VPS + DevOps Cost$9,480/year
Differential vs SaaS LicensingSavings of $2,760/year
Usage Surcharges & Bill Shock Simulator: BisimiaWhat usage costs as you scale
Detect overage penalties before they impact engineering budget.
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Prototype / MVP (10 GB)

Included base quota in plan: 20 GB.
Low Risk / Predictable Bill
Base Monthly Rate
$20/mo
Fixed subscription or contracted tier
Overage Penalty
$0/month extra
Usage covered within plan quota
Estimated Monthly Invoice
$20/mo
Total monthly cost before taxes
Technical Mitigation Recommendation:

Suitable for development; verify concurrent connection limits.

Base Production (50 GB)

Included base quota in plan: 20 GB.
Low Risk / Predictable Bill
Base Monthly Rate
$20/mo
Fixed subscription or contracted tier
Overage Penalty
+$5/month extra
Variable surcharge for consumption above plan quota
Estimated Monthly Invoice
$25/mo
Total monthly cost before taxes
Technical Mitigation Recommendation:

Implement table compression policies and temporal partitioning.

Active Growth (250 GB)

Included base quota in plan: 20 GB.
High Risk / Accelerated Overages
Base Monthly Rate
$20/mo
Fixed subscription or contracted tier
Overage Penalty
+$41/month extra
Variable surcharge for consumption above plan quota
Estimated Monthly Invoice
$61/mo
Total monthly cost before taxes
Technical Mitigation Recommendation:

Offload cold backups to standard object storage (S3).

Large Scale (1.000 GB (1 TB))

Included base quota in plan: 20 GB.
Critical Risk / Severe Bill Shock
Base Monthly Rate
$20/mo
Fixed subscription or contracted tier
Overage Penalty
+$176/month extra
Variable surcharge for consumption above plan quota
Estimated Monthly Invoice
$196/mo
Total monthly cost before taxes
Technical Mitigation Recommendation:

Migrate to dedicated instance or self-hosted cluster to curtail I/O fees.

Procurement Strategy & Discounts: BisimiaB2B Negotiation Playbook
Corporate executive level with highest authority to approve budgetary exceptions.
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Fair Market Price & B2B Procurement Benchmark

Non-renewal notice: 30 days before expirationMedian achieved discount: -12%
Public List Price
Custom / Contact
100% baseline
Audited Market Average
-12% median
~88% of list price
Optimized Target Price
-20% target
Max achievable discount (Q4 / multi-year): -20%
Security & Data Exit
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Compliance & Security Standards: Bisimia

SOC 2 Type IINot reported
ISO 27001Not reported
GDPR / RGPDNot reported
HIPAANot reported
PCI-DSSNot reported
Jurisdiction & Legal Sovereignty
🇺🇸United States [US]Subject to US CLOUD ActGDPR DPA Available
SSO Availability (SAML Enterprise)
No SSO Documented
Data Residency
GLOBAL
AI Privacy Policy
Zero customer data retention
Data Liberation & Migration Runbook: BisimiaCSV · JSON
Actionable escape runbook and credential export guarantees to mitigate vendor lock-in.
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Supported Structured Export Formats
CSVJSON
Password Hash Portability
Subject to Support Ticket (Manual Process)

Credential hash export requires commercial mediation or formal support ticket approval.

CLI Command / Rescue Endpoint
GET /api/v1/export/full (Requires Enterprise API Token)
Exit Protocol & Migration Notes

Automated extraction via Enterprise API or formal support request.

Deployment & Infrastructure Requirements: BisimiaDocker
Hardware specs and Docker directives to run on local servers, dedicated VPS, or Kubernetes without telemetry leak to the cloud.
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Minimum Memory1 GB RAM (Recommended)
Compute CPU1 vCPU
Runtime / LanguageTypeScript / Go / Rust
Code LicenseOpen Source
Docker CLI Directive
docker run -d --name bisimia -p 8080:8080 bisimia:latest
Companion Services & Dependencies:
PostgreSQL 15+Redis 7+
Community & Repository
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Technical Reputation of Bisimia

65/100 Technical Trust

Frequent Praises in Production

  • Full TLA+ execution in the browser without local configurations.
  • Facilitates rapid exploration of counterexamples via a visual interface.
  • Eliminates the friction of installing heavy dependencies for formal verification.

Reported Production Frictions

  • Lack of team collaboration or project management features.
  • Browser-based deployment limits the processing of extremely large specifications.
Commercial Treatment & Vendor Lock-in:Requires Sales Contact

Assisted cancellation requiring meeting with account team or contract notice period.

Frequently Asked Technical Questions (Bisimia)

What is Bisimia?

Bisimia is a software platform that allows editing, analyzing, and verifying TLA+ specifications within a web browser, simplifying access to formal methods tools.

Do I need Java installed to run specifications?

No, Bisimia handles execution and model checking remotely or via WebAssembly, so you do not need a Java runtime installed on your local machine.

Can I work with existing TLA+ specifications?

Yes, the platform allows you to import specification files to work on them, facilitating the transition from other traditional TLA+ development environments.

Direct Alternatives

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