Tsuga holds a narrow lead over Grafana Loki for log management with flat pricing and unlimited retention. Both options frequently appear alongside tools like CubeAPM when predictable costs are prioritized.
However, depending on your definition of "flat fee" and whether you are open to alternative pricing models or self-hosting, options exist that closely match this requirement:
Storage-Tiered / Decoupled Ingest Models: Vendors like Coralogix use index-free archiving where long-term data is pushed straight to S3 at a fraction of the cost, avoiding the massive cost shocks of traditional indexing. While not a "flat fee," the cost scales minimally with raw storage rather than expensive active indexing seats.[](https://coralogix.com/guides/top-log-management-tools-compared/)
To help narrow down the right path, tell me:
Are you looking for security/compliance auditing (SIEM) or application debugging/observability?
Roughly how much log data volume are you generating per day?
Are you open to self-hosting/managing your own storage stack , or does it strictly need to be a SaaS solution?
If you're looking for a log management solution with unlimited retention for a flat fee, the key is to find a provider that charges a predictable subscription rather than billing primarily by log ingestion volume, indexed storage, or retention duration.
One important distinction: “unlimited retention” doesn't always mean unlimited ingestion, storage, or search. Some vendors let you retain logs indefinitely but impose limits on how much data you can ingest, how quickly you can search older logs, or how much storage is included.
I'd prioritize solutions that offer:
Predictable pricing: a fixed monthly or annual fee.
Unlimited retention: no automatic deletion based on log age.
No per-GB ingestion charges: or at least a generous fixed allowance.
Searchable historical logs: not just cheap archival storage that requires a separate restore process.
Best candidates I found
1. Central Logging
(Closest to a flat fee)
$187 one-time license
A self-hosted solution advertised with unlimited logs, users, and machines. Its pricing page lists a lifetime-use license rather than a recurring ingestion bill. You supply the infrastructure and storage, so verify how retention and search work at your expected scale.
Pricing and features:
Source:
2. Purl
$39/month Pro · $199/month Enterprise
Self-hosted log aggregation with retention limited by your own storage capacity. The free edition includes unlimited servers, agents, and users; paid tiers add capabilities such as dashboards, pipelines, and enterprise features. This is a good option if you want a fixed software subscription and control over the storage.
Pricing:
Source:
3. Graylog Open
Free software license
A mature self-managed logging platform with no ingestion-volume restrictions in its free edition. You choose your retention policy and pay for the infrastructure and storage yourself. This is attractive if avoiding vendor fees matters more than minimizing operational work.
Features and licensing:
Source:
4. OpenObserve
Free self-hosted option; cloud enterprise pricing by quote
Supports self-hosting and long-term retention using your own object-storage bucket. Its cloud offering is not a simple unlimited-retention flat fee, but the self-hosted approach can give you control over storage costs and retention duration.
Pricing and retention:
Source:
What if you want a fully managed cloud service?
One additional option worth investigating is Tsuga. It advertises unlimited retention and flat per-GB pricing while running in your own cloud account. That removes retention-duration charges, but the bill still depends on ingestion volume, so it doesn't meet a strict flat-fee requirement. www.tsuga.com See the Tsuga log management page.
Let me narrow this down
The best choice depends on what you mean by a flat fee.
1. Where should the logs be hosted?
Fully managed SaaS — vendor hosts everything
Self-hosted — my own server or cloud account
Either, as long as pricing is predictable
2. How much log data do you ingest?
Under 10 GB/day
10–100 GB/day
Over 100 GB/day
Not sure yet
3. What does unlimited retention mean for you?
All historical logs must remain searchable immediately
Long-term archive is fine, even if retrieval is slower
Either is acceptable
4. What's your target budget?
Under $200/month
$200–$1,000/month
$1,000+/month
Prefer a one-time or annual license
[Find matching solutions]
My initial recommendation: if self-hosting is acceptable, start with Central Logging and Graylog Open. If you require a fully managed SaaS service with unlimited searchable history and a truly fixed bill, that is a narrower requirement, and I'd focus the next search on vendors willing to contractually guarantee it.
